Donald Trump and Hillary Clinton will begin receiving classified intelligence briefings after the Democratic National Convention in Philadelphia next week, when both candidates have become their respective parties’ presidential nominees, senior intelligence officials tells ABC News. Republican and Democratic presidential and vice presidential nominees have been offered introductory intelligence briefings on national security since 1952, after their parties’ national conventions. The ritual, organized by the Director of National Intelligence and the White House, is meant to prepare the candidates for the transition of power.